EP1271637A2 - Verfahren zur Herstellung eines DMOS-Transistors - Google Patents
Verfahren zur Herstellung eines DMOS-Transistors Download PDFInfo
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- EP1271637A2 EP1271637A2 EP02012664A EP02012664A EP1271637A2 EP 1271637 A2 EP1271637 A2 EP 1271637A2 EP 02012664 A EP02012664 A EP 02012664A EP 02012664 A EP02012664 A EP 02012664A EP 1271637 A2 EP1271637 A2 EP 1271637A2
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- trench
- shaped structure
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- produced
- drain
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
- H01L29/0852—Source or drain regions of field-effect devices of field-effect transistors with insulated gate of DMOS transistors
- H01L29/0873—Drain regions
- H01L29/0878—Impurity concentration or distribution
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/0603—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by particular constructional design considerations, e.g. for preventing surface leakage, for controlling electric field concentration or for internal isolations regions
- H01L29/0642—Isolation within the component, i.e. internal isolation
- H01L29/0649—Dielectric regions, e.g. SiO2 regions, air gaps
- H01L29/0653—Dielectric regions, e.g. SiO2 regions, air gaps adjoining the input or output region of a field-effect device, e.g. the source or drain region
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66659—Lateral single gate silicon transistors with asymmetry in the channel direction, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
- H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26586—Bombardment with radiation with high-energy radiation producing ion implantation characterised by the angle between the ion beam and the crystal planes or the main crystal surface
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
- H01L29/08—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
Definitions
- the present invention relates to a method for producing a DMOS transistor, according to the preamble of claim 1.
- EP 0 837 509 A1 Another method is known from EP 0 837 509 A1. This is done in one DMOS transistor below a LOCOS oxide creates a self-aligned drift area. It is disadvantageous that the doping of the drift region is introduced before the oxidation and the proportion of the dopant that diffuses into the oxide during oxidation is only imprecise lets determine. Furthermore, the high temperature load during oxidation causes very broad dopant distribution, which in turn causes greater inaccuracy in the dopant concentration caused. Furthermore, there is a large silicon thickness below the oxide required to increase the reverse voltage using the so-called "RESURF" effect. Overall, the scatter in the electrical parameters is caused by the process scatter of the transistor enlarged.
- a goal in development in the field of DMOS transistors is to save space To produce structures that have low field strengths when reverse voltage is present, a generation of load carriers that lead to a breakthrough within the Lead component to avoid.
- Another goal of development for DMOS transistors is to achieve a low specific on-resistance Rsp in order to be integrated Circuits in which the DMOS transistors play a significant part in the Take up total chip area, the area consumption of such an integrated Reduce circuit.
- the present invention is therefore based on the object Specify the method with which DMOS transistors in a small area for high reverse voltages have it made.
- the essence of the invention is that a trench-shaped in a DMOS transistor Structure is generated in which by selecting the dopant profile in the range trench-shaped structure a high breakdown voltage with a small lateral expansion of the DMOS transistor can be achieved.
- a res first conductivity type which has a surface layer in which a source region and a drain region of a second conductivity type and a well region of a first Conductivity type, which includes the source region, is formed, and on the surface of the semiconductor body, a gate region is formed which starts from the Source area extends over at least a portion of the well area, starting from a trench-shaped surface of the semiconductor body in part of the surface layer Structure created.
- a doping is in the bottom area of the trench-shaped structure a second conductivity type with a first concentration and in the source side Sidewall of the trench-shaped structure with a doping of the second conductivity type a second concentration and in the drainage side wall of the trench-shaped structure generates a doping of the second conductivity type with a third concentration.
- a major advantage of the new process is that the different Concentration of the dopant in the source side wall compared to the drain side Sidewall in connection with the dopant concentration in the bottom area of the trench-like structure, which together define the drift region of the transistor, a simple optimization within a parameter field, which is essentially from the specific Starting resistance Rsp, the breakdown voltage Vbreak and the size and shape the SOA (safe operation area) area is determined, carried out.
- a simple optimization within a parameter field which is essentially from the specific Starting resistance Rsp, the breakdown voltage Vbreak and the size and shape the SOA (safe operation area) area is determined, carried out.
- Driver structures can thus be used to produce transistors with a small total area.
- the onset and the strength of the RESURF effect by means of an adjustable vertical derivation of the potential gradient of the applied reverse voltage in particular optimize advantageously.
- the region of the tub the drain expand and the trench-shaped structure partially or completely within to generate the area of the tub the border area being the area of the tub the drain completely encloses.
- the tub expands in the direction of the drain and the higher the doping of the well the lower the specific Starting resistance Rsp during the breakdown voltage via an increased RESURF Effect decreases only slightly, because the higher doping of the tub compared to the doping of the semiconductor body a higher doping of the bottom and the source side wall allows. If the tub completely surrounds the area of the drain, let in Save mask step in the manufacture of the DMOS transistor.
- the drain doping is below the range creates an extension area that completely encloses the drain area, whereby the doping of the extension area is of the same conductivity type, but less Concentration as the drain area shows. Except for the suppression of a draining-sided Breakthrough, which occurs especially when the tub is heavily doped, is caused by the Reduction of the resistance in the area of the drain-side side wall of the specific on-resistance Rsp reduced. The specific on-resistance is reduced particularly strongly Rsp if the extension area and or the drain area are directly on the Connect the side wall of the trench-shaped structure on the drain side.
- the trench-like structure can be produced using a dry etching process, such as a "shallow trench process" (STI), perform and with an insulating material, such as by means of a CVD oxide or nitride, fill and planarize using a CMP process.
- a dry etching process such as a "shallow trench process" (STI)
- STI shallow trench process
- the trench-shaped structure is created using a V-trench etching generated and in a subsequent LOCOS oxidation, due to the lower Temperature load is preferably produced by high pressure oxidation, refilled.
- the side walls and the floor are doped before the. LOCOS oxidation carried out, the introduced dose of the dopants by the proportion of the oxidation diffused into the oxide, is increased.
- the DMOS transistor is in the surface layer of a wafer with an insulating intermediate layer. It is advantageous if the Thickness of the surface layer remaining underneath the trench-shaped structure half and a factor of 5 the depth of the trench-shaped structure. It is also advantageous if the drain area and or the extension area, the tub area and the source area connect directly to the insulating interlayer to avoid the parasitic Suppress capacities. Another advantage is that the required layer thickness the surface layer is in the range of a few ⁇ m, since the formation of a highly doped buried canal following the bottom of the trench-shaped structure, has a small vertical extent.
- Table 1 shows a process sequence for the production of DMOS transistors in which process steps 4 to 8 are additionally inserted based on a BCDMOS process sequence known from the prior art.
- a trench-shaped structure with a freely selectable doping in the respective side wall and an independently selectable doping in the bottom region is thus produced between the source and drain region of N or P DMOS transistors.
- N and P-DMOS transistors, bipolar and complementary MOS transistors for an integrated circuit can be produced simultaneously.
- Standard DMOS module 1.
- STI process anisotropic silicon etching
- IMPLANTATION VERTICAL AND TILT FOR FLOOR AND DRAIN-SIDED SIDEWALL
- MASK STEP 9th Forming component boxes using a deep trench process (mask step) 10th Filling the trench openings or the trench-shaped structure with CVD-OXID 11th CMP planarization 12th Extension implantation (mask step) 13th Threshold voltage implantation 14th gate oxidation 15th Gate poly deposition and patterning (mask step) 16th LDD implantations (mask step) 17th Source / drain implantations (mask step) 18th BPSG deposition 19th Contact window etching (mask step) 20th Metall1 (mask step) 21st Via etching (mask step) 22nd Metall2 (mask step)
- a silicon wafer with an insulating intermediate layer SOI wafer.
- an opening is defined by means of a mask step 4 which in a subsequent step 5 the doping for the side walls of the to be generated Structure is implanted.
- a silicon etching is used trench-shaped structure and then in a subsequent step 7 the Side walls covered with a protective layer.
- a two-stage implantation for doping the floor and the side wall on the drain. Since process steps 4 to 8 are carried out with a single mask, the self-adjusted implants.
- the filling of the trench-like structure will performed together with the filling of the trench structures.
- the gate regions and the source / drain regions are then defined and by means of a Contact window process connected to the trace system.
- FIG. 1 a schematic cross section of a N-DMOS transistor 100 is shown with a trench-shaped structure.
- the production of the N-DMOS transistor 100 is inside by means of a process sequence (not shown) of a semiconductor body 5, which has an insulating intermediate layer (4) and a positive Has doping carried out.
- a P-tub 20 is produced in a first process step in the semiconductor body 5 .
- a Protective layer which consists for example of a nitride and or an oxide, by a Mask step an opening for introducing a dopant with negative polarity, such as arsenic or phosphorus.
- an anisotropic silicon etching for example by means of an STI etching, produces a trench-shaped structure and the dopant in the bottom area is completely removed.
- a scattering oxide is generated, the thickness of which is sufficient to pass through the dopant to effectively suppress a second implantation in the bottom region of the trench-shaped structure. Since the side walls are only slightly inclined, oxide thicknesses in the area are sufficient of a few 100 A.
- the oxidation step simultaneously turns the first
- the remaining dopant diffuses into the implantation step, with a first on the source side Area 40, with a first concentration and on the drain side a second area 60, with a second concentration.
- a dopant with a negative one Polarity introduced in a subsequent process step, in a second Implantation step which is carried out in two stages.
- part of the total dose becomes vertical, i.e. only introduced into a floor area 50 and in the second stage the remaining dose introduced at a tilt angle of, for example, 60 degrees, so that the concentration in the drain-side region of the floor 50 and in the drain-side wall 60 is increased.
- region 60 has a high total Concentration, the area 50 a medium concentration and the area 40 a lower Concentration of a dopant from the second polarity.
- a subsequent one Process step is the trench-shaped structure with an insulating material, for example filled with a CVD oxide 65 and through the surface of the trench-shaped structure planarized a CMP step.
- a gate terminal G with a gate oxide 30 and a polysilicon layer 35 generated.
- a source connection S with a highly doped region 10 and Drain connection D with a highly doped region 80, which have a negative polarity, as well as a body connection B with a highly doped region 15, which has a positive polarity has generated.
- an extension area 70 is located below the drain connection D. generated with a negative polarity, the concentration of which is lower than that of the region 80 is.
- the extension area 70 and the drain area 80 directly adjoin the drain-side side wall of the trench-shaped structure, so that the concentrations of areas 60, 70, 80 add up along the sidewall.
- the area 10 enclosed by the area of the P-tub 20, the lateral extent the P-tub 20 can change along the direction of x1.
- the P-tub also borders Area (20) to the insulating intermediate layer 4.
- a particular advantage of the process sequence shown is that both N-DMOS as well as P-DMOS transistors can be produced together, with the production the trench-shaped structure by means of dry etching the temperature load in the manufacturing process is significantly reduced.
- This can be used along the trench-shaped Generate structurally steep, spatially limited, differently doped areas with which the electrical parameters of the DMOS transistor can be easily optimized.
- the low specific on resistances Rsp can be with the low specific on resistances Rsp and achieve high blocking voltages at the same time large current carrying capacities in a small area, because, among other things, the voltage drop in the drift region of the transistor is reduced.
- Further can be by inserting epitaxial layers and / or buried layer layers Simply isolate the DMOS transistor from each other with few additional process steps.
- the RESURF effect can be increased in a simple manner by means of the doping concentration of the semiconductor body 5 and / or the troughs.
- FIG. 2a shows the cross-section of the doping layers of the part between gate region 35 and drain region 80 of the N-DMOS transistor 100 from FIG. 1 is shown.
- the N-DMOS 100 comes with a process sequence such as that used in connection with the drawing documents 1, was produced, with an extension on the surface of the semiconductor structure a passivating layer of oxide 105 is applied. Furthermore, the layer 105 both an opening for the gate connection G and an opening for the drain connection D, which are filled with a metal. Furthermore, in areas 20, 35, 50, 70 and 80 the polarity of the dopant is represented by the direction of hatching.
- the level of concentration of the dopant in the respective area is represented by the density of the hatching.
- the area of the P-tub 20 includes the extension area 70 and points a higher doping compared to the semiconductor body 5.
- the N-DMOS Transistor 100 also has a higher trench-shaped structure in the area of the bottom 50 Endowment on.
- FIG. 2b shows the potential profile of the transistor shown in FIG. 2a with an applied one Reverse voltage shown shortly before the breakdown of the transistor.
- the The array of individual potential lines shows the potential course between the channel area below of gate oxide 30 and the region of drain 70, 80 again, the location of the largest Field strength is represented by the location with the highest density of potential lines.
- the higher doping in the area of the P-well 20 by means of the higher Doping the bottom area 50 of the trench-shaped structure has a high RESURF effect and thus causes an even potential distribution in the drift area.
- the area of the source side wall in the trench-shaped structure through the formation preferably cleared a space charge zone, so that the RESURF effect already at low voltages and field strength peaks are avoided.
- Another advantage is the easy transferability of the new process to wafers, which have an insulating intermediate layer, such as SOI wafers.
- the vertical reduce spatially limited highly doped areas below the trench-shaped structure the thickness of the surface layer, since an also highly doped p-well with less vertical expansion is sufficient to produce a RESURF effect.
- the underlying insulating interlayer which generally has a higher dielectric constant than silicon, by an intrinsic bundling of the potential lines the RESURF effect is increased and high due to the low field strength in the drift area Reverse voltages between drain and source reached.
- the layer thickness, the surface layer lying on the insulating intermediate layer, low hold and other types of components, such as bipolar and MOS transistors with a few additional process steps cost-effectively together with the Integrate DMOS transistors on a wafer.
- the small thickness of the surface layer suppress the parasitic capacitance by a Part of the doping areas, such as the p-well or the extension area, to be extended to the insulating intermediate layer.
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Abstract
Description
- Fig. 1
- einen Querschnitt eines DMOS Transistors mit einer grabenförmigen Struktur im Driftgebiet, und
- Fig. 2a
- ein Querschnitt der Dotierungsschichten des DMOS Transistors zwischen Gate- und Drainbereich, und
- Fig. 2b
- ein Potentialverlauf des DMOS Transistors aus der Figur 2a bei einer anliegenden Sperrspannung.
Standart DMOS Modul: | |
1. | Material Start: Silizium-Wafer mit einer isolierenden Zwischenschicht |
2. | Bildung der P-well (Maskenschritt) |
3. | Bildung der N-well (selbstjustiert zur P-well) |
4. | BILDUNG DER ÖFFNUNG FÜR EINE GRABENFÖRMIGE STRUKTUR (MASKENSCHRITT) |
5. | TILT-IMPLANTATION (FÜR SEITENWAND) |
6. | BILDUNG GRABENFÖRMIGER STRUKTUR MITTELS ANISOTROPE SILIZIUMÄTZUNG (STI-PROZESS) (MASKENSCHRITT) |
7. | BILDUNG EINER SCHUTZSCHICHT DURCH OXIDATION /DIFFUSION DER EINGEBRACHTEN DOTIERUNG |
8. | IMPLANTATION SENKRECHT UND TILT (FÜR BODEN UND DRAINSEITIGER SEITENWAND) (MASKENSCHRITT) |
9. | Bildung von Bauelementboxen mittels eines Deep-Trench Prozeß (Maskenschritt) |
10. | Füllen der Trenchöffnungen bzw. der grabenförmigen Struktur mit CVD-OXID |
11. | CMP-Planarisierung |
12. | Extension-Implantation (Maskenschritt) |
13. | Schwellspannungs-lmplantation |
14. | Gateoxidation |
15. | Gate-Polyabscheidung und Strukturierung (Maskenschritt) |
16. | LDD Implantationen (Maskenschritt) |
17. | Source/Drain Implantationen (Maskenschritt) |
18. | BPSG-Abscheidung |
19. | Ätzung der Kontaktfenster (Maskenschritt) |
20. | Metall1 (Maskenschritt) |
21. | Via-Ätzung (Maskenschritt) |
22. | Metall2 (Maskenschritt) |
Claims (19)
- Verfahren zur Herstellung eines DMOS-Transistors (100) mit einem Halbleiterkörper (5),der eine Oberflächenschicht mit einem Source Bereich (10) und einem Drain Bereich (80) eines zweiten Leitfähigkeitstyps und einen ersten den Source Bereich (10) umschließenden Wannen Bereich (20) eines ersten Leitfähigkeitstyps aufweist, undauf der Oberfläche der Oberflächenschicht des Halbleiterkörpers (5) ein Gate Bereich (35) ausgebildet ist, der sich beginnend von dem Source Bereich (10) über wenigstens einen Teil des Wannen Bereichs (20) erstreckt,ausgehend von der Oberfläche des Halbleiterkörpers (5) in der Oberflächenschicht eine grabenförmige Struktur erzeugt wird, undim Bodenbereich (50) der grabenförmigen Struktur eine Dotierung des zweiten Leitfähigkeitstyps mit einer ersten Konzentrationswert erzeugt wird, undin der sourceseitigen Seitenwand (40) der grabenförmigen Struktur eine Dotierung des zweiten Leitfähigkeitstyps mit einer zweiten Konzentrationswert erzeugt wird, undin der drainseitigen Seitenwand (60) der grabenförmigen Struktur eine Dotierung des zweiten Leitfähigkeitstyps mit einer dritten Konzentrationswert erzeugt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die grabenförmige Struktur teilweise oder vollständig innerhalb des Wannen Bereichs (20) erzeugt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Wannen Bereich (20) den Drain Bereich (80) umschließt.
- Verfahren nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß unterhalb des Drain Bereichs (80) ein Extension Bereich (70) eines zweiten Leitfähigkeitstyps erzeugt wird, der den Drain Bereich (80) umschließt.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Drain Bereich (80) unmittelbar angrenzend an einer Seitenwand der grabenförmigen Struktur erzeugt wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Extension Bereich (70) unmittelbar angrenzend an einer Seitenwand der grabenförmigen Struktur erzeugt wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß ein Abstand zwischen der Seitenwand der grabenförmigen Struktur und dem Extension Bereich (70) erzeugt wird, der vorzugsweise zwischen 0.5 µm und 4.0 µm liegt.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein Abstand zwischen der Seitenwand der grabenförmigen Struktur und dem Drain Bereich (80) erzeugt wird, der vorzugsweise zwischen 0.5 µm und 4.0 µm liegt.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß in den Seitenwänden und im Bodenbereich (50) der grabenförmigen Struktur eine Dotierung auf einem höheren Konzentrationswert als im Halbleiterkörper (5) und oder im Wannen Bereich (20) erzeugt wird.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß eine grabenförmige Struktur erzeugt wird, in der zweite Wert und der dritte Wert der Konzentration des Dotierstoffes gleich sind.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß eine grabenförmige Struktur erzeugt wird, in der zweite Wert der Konzentration kleiner als der dritte Wert der Konzentration des Dotierstoffes ist.
- Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß eine grabenförmige Struktur erzeugt wird, deren Aspekt Verhältnis oberhalb 0.5 und deren Breite in einem Bereich zwischen 0.5 µm und 4.0 µm liegt.
- Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß eine grabenförmige Struktur erzeugt wird, die im Bodenbereich (50) eine geringere Breite als an der Oberfläche aufweist.
- Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß die grabenförmige Struktur mittels einer STI Ätzung erzeugt und mit einem isolierenden Material, vorzugsweise mittels eines Oxids, aufgefüllt wird.
- Verfahren nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß die grabenförmige Struktur mittels einer LOCOS-Oxidation erzeugt wird.
- Verfahren nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß der Halbleiterkörper unterhalb der Oberflächenschicht eine isolierende Zwischenschicht (4) aufweist und der DMOS Transistor in der Oberflächenschicht erzeugt wird.
- Verfahren nach Anspruch 16, dadurch gekennzeichnet, daß die Dicke der Oberflächenschicht unterhalb der grabenförmigen Struktur in einem Bereich zwischen der Hälfte und einem Faktor 5 der Tiefe der grabenförmigen Struktur liegt.
- Verfahren nach Anspruch 16 oder 17, dadurch gekennzeichnet, daß der Drain Bereich (80) und oder der Extension Bereich (70), sowie der Wannen Bereich (20) und der Source Bereich (10) unmittelbar angrenzend an die isolierende Zwischenschicht (4) erzeugt wird.
- Verwendung des Verfahrens nach einem der Ansprüche 1 bis 17 zur Herstellung einer integrierten Schaltung
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10131706A DE10131706B4 (de) | 2001-06-29 | 2001-06-29 | Verfahren zur Herstellung eines DMOS-Transistors |
DE10131706 | 2001-06-29 |
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EP1271637A2 true EP1271637A2 (de) | 2003-01-02 |
EP1271637A3 EP1271637A3 (de) | 2007-06-06 |
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EP02012664A Withdrawn EP1271637A3 (de) | 2001-06-29 | 2002-06-07 | Verfahren zur Herstellung eines DMOS-Transistors |
Country Status (4)
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US (1) | US6878603B2 (de) |
EP (1) | EP1271637A3 (de) |
JP (1) | JP2003060205A (de) |
DE (1) | DE10131706B4 (de) |
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KR100788367B1 (ko) * | 2006-12-29 | 2008-01-02 | 동부일렉트로닉스 주식회사 | 이디모스 트랜지스터를 갖는 반도체 소자 및 그 형성 방법 |
KR100887030B1 (ko) * | 2007-05-29 | 2009-03-04 | 주식회사 동부하이텍 | 반도체 소자의 고전압 드리프트 형성 방법 |
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JP2011204935A (ja) * | 2010-03-26 | 2011-10-13 | Mitsubishi Electric Corp | 半導体装置とその製造方法 |
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JP2015008184A (ja) * | 2013-06-25 | 2015-01-15 | 株式会社 日立パワーデバイス | 半導体装置 |
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Also Published As
Publication number | Publication date |
---|---|
JP2003060205A (ja) | 2003-02-28 |
US6878603B2 (en) | 2005-04-12 |
EP1271637A3 (de) | 2007-06-06 |
DE10131706B4 (de) | 2005-10-06 |
US20030003669A1 (en) | 2003-01-02 |
DE10131706A1 (de) | 2003-01-30 |
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